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The experimental distributions of $\Xmax$ obtained with the Yakutsk EAS arrayat fixed energies of $5 \times10^{17}$, $1\times10^{18}$ and $5\times10^{18}$eV are analysed. A recent version of the QGSJET model is used as a tool of ouranalysis. In the framework of this model, the most adequate mass composition ofprimary particles satisfying the experimental data on $\Xmax$ is selected.Comment: 19th European Cosmic Ray Symposium, Aug 30 - Sep 3 2004, Florence,  Italy. 3 pages, 1 figure. Submitted for publication in International Journal  of Modern Physics

international journal of modern physics a

FLUCTUATIONS OF Xmax AND PRIMARY PARTICLE MASS COMPOSITION IN THE RANGE OF ENERGY 5 × 1017 - 3 × 1019EV BY YAKUTSK DATA